fblog/0009-fblog-register-all-handlers-on-module-init.patch

   1 From 1ca9b0e3d8f11b5fd0ce99511b44b8be2c89d3ba Mon Sep 17 00:00:00 2001
   2 From: David Herrmann <dh.herrmann@googlemail.com>
   3 Date: Sat, 16 Jun 2012 23:28:18 +0200
   4 Subject: [PATCH 09/10] fblog: register all handlers on module-init
   5
   6 We now create a new "fblog" device when initializing the fblog module. We
   7 register the "active" sysfs-file with it so user-space can now access
   8 fblog. We also register the framebuffer-notifier and console-handler so
   9 fblog is ready to go.
  10
  11 Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
  12 ---
  13  drivers/video/console/fblog.c |   59 +++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 59 insertions(+)
  15
  16 diff --git a/drivers/video/console/fblog.c b/drivers/video/console/fblog.c
  17 index 79bfbcc..9d3b072 100644
  18 --- a/drivers/video/console/fblog.c
  19 +++ b/drivers/video/console/fblog.c
  20 @@ -92,6 +92,7 @@ struct fblog_fb {
  21  };
  22
  23  static struct fblog_fb *fblog_fbs[FB_MAX];
  24 +static struct device *fblog_device;
  25  static atomic_t fblog_active;
  26
  27  static void fblog_buf_resize(struct fblog_buf *buf, size_t width,
  28 @@ -609,13 +610,71 @@ static ssize_t fblog_dev_active_store(struct device *dev,
  29  static DEVICE_ATTR(active, S_IRUGO | S_IWUSR | S_IWGRP, fblog_dev_active_show,
  30                    fblog_dev_active_store);
  31
  32 +static void fblog_dev_release(struct device *dev)
  33 +{
  34 +       kfree(dev);
  35 +       module_put(THIS_MODULE);
  36 +}
  37 +
  38  static int __init fblog_init(void)
  39  {
  40 +       int ret;
  41 +
  42 +       fblog_device = kzalloc(sizeof(*fblog_device), GFP_KERNEL);
  43 +       if (!fblog_device) {
  44 +               pr_err("fblog: cannot allocate device\n");
  45 +               ret = -ENOMEM;
  46 +               goto err_out;
  47 +       }
  48 +
  49 +       __module_get(THIS_MODULE);
  50 +       device_initialize(fblog_device);
  51 +       fblog_device->class = fb_class;
  52 +       fblog_device->release = fblog_dev_release;
  53 +       dev_set_name(fblog_device, "fblog");
  54 +
  55 +       ret = device_add(fblog_device);
  56 +       if (ret) {
  57 +               pr_err("fblog: cannot add device\n");
  58 +               goto err_dev;
  59 +       }
  60 +
  61 +       ret = fb_register_client(&fblog_notifier);
  62 +       if (ret) {
  63 +               pr_err("fblog: cannot register framebuffer notifier\n");
  64 +               goto err_dev_rm;
  65 +       }
  66 +
  67 +       ret = device_create_file(fblog_device, &dev_attr_active);
  68 +       if (ret) {
  69 +               pr_err("fblog: cannot create sysfs entry\n");
  70 +               goto err_fb;
  71 +       }
  72 +
  73 +       register_console(&fblog_con_driver);
  74 +
  75         return 0;
  76 +
  77 +err_fb:
  78 +       fb_unregister_client(&fblog_notifier);
  79 +err_dev_rm:
  80 +       device_del(fblog_device);
  81 +err_dev:
  82 +       put_device(fblog_device);
  83 +err_out:
  84 +       return ret;
  85  }
  86
  87  static void __exit fblog_exit(void)
  88  {
  89 +       unregister_console(&fblog_con_driver);
  90 +       device_remove_file(fblog_device, &dev_attr_active);
  91 +       device_del(fblog_device);
  92 +       fb_unregister_client(&fblog_notifier);
  93 +       console_lock();
  94 +       fblog_deactivate();
  95 +       console_unlock();
  96 +       put_device(fblog_device);
  97  }
  98
  99  module_init(fblog_init);
 100 --
 101 1.7.10.4
 102